Fixed: FS#2109 - Email address validation via API method(s) is inadequate (and results in false-negatives)

- Added a new IP validator to the tform library which validates IPv4 and IPv6 addresses.

I've changed the id HTML attributes of the check boxes. You can still group post requests on name attributes while using the id to keep the items unique in the DOM tree. i saw some commented code already being there but wasn't functioning, so i rewrote the original lines.
This only goes for type: CHECKBOXARRAY and RADIO

- Fixed {RECORDID} placeholder in SQL datasource strings.

Added global functions library which conatins a mail functin that supports attachments and a array_merge function that merges arrays that conatain numeric keys and strings correctly.

Updated english languages files
Updated czech languages files

Enhancement of the Website-List. The user can only select the server as filter, he has some sites at (and not ALL Servers of the server-farm)

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You can now set an array of predefined values in a tform select field together with a datasource. The data of the "value" array and the datasource data get merged, so that the datasource data gets appended to the value array.

Added new "DATE" datatype which uses the native mysql date format instead of tstamps in tform library. The old tstamp datatype as been renamed to "DATETSTAMP".

- Added a missing language string for the website form.

Merged all language files.

Changed the characters that are available to be used in the password salt to avoid decoding problems with certain 64Bit Linux systems.

Changed: removed datalog update function in tform.inc.php and just left the stub function there for legacy support with a call to the new function in the db_mysql.inc.php.

Improved client and reseller limit checks